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"Andreessen Horowitz is a VC firm that believes deeply in helping entrepreneurs and helping change the product and business landscape," Sinofsky said. After getting to know the people who populate the firm, he said that it was cool to see "the commitment to fostering innovation, product creation, and working with product-focused entrepreneurs."

The new job does leave Sinofsky free to explore other career options. He said that he'll remain an Entrepreneur in Residence at Harvard Business School but "continue to pursue other business and product development opportunities that arise."